Curable polyepoxide and glycol polyamine compositions



United States Patent 6 3,306,809 CURABLE POLYEPOXIDE AND GLYCOL POLYAMINE COMPOSITIONS Frank L. Williamson, South Plainfield, and Richard J. Burns, Somerville, N.J., assignors to Union Carbide Corporation, a corporation of New York No Drawing. Filed Aug. 21, 1961, Ser. No. 132,577 27 Claims. (Cl. 161-185) This invention relates to curable polyepoxide compositions and to cured products produced therefrom. More specifically, this invention relates to curable polyepoxide compositions which have particular utility for use as adhesive coatings characterized, on being cured, by excellent flexibility, excellent elongation and by excellent heat-aging properties.

Polyepoxide compositions usually contain curing agents which eflect a cure of the compositions to infusible products, generally upon application of heat thereto. It has been found, however, that polyepoxide compositions containing conventional curing agents, such as m-phenylene diamine and hexahydrophthalic anhydride, upon being cured, are characterized by poor flexibility and by poor heat-aging properties. Consequently, presently known polyepoxide compositions have found limited use in applications wherein both excellent flexibility and excellent heat-aging properties are essential, as for example, as adhesive coatings for bonding implosion shields to television picture tubes. Conventional olyepoxide compositions, upon curing, do not possess sufiicient flexibility to satisfactorily bond implosion shields to the curved surfaces of television picture tubes. Furthermore, such compositions, once cured, become increasingly rigid upon high temperature aging and readily delaminate from surfaces to which they have been applied.

The compositions of the present invention, upon being cured, have excellent flexibility, excellent elongation and excellent heat-aging properties. The compositions of this invention, therefore, can be advantageously used to bond implosion shields to curved surfaces of television picture tubes, as once cured, they possess such excellent heat-resistivity that they remain flexible and bonded thereto even upon being aged at relatively high temperatures.

The compositions of this invention comprise a curable mixture of a polyepoxide having an epoxy equivalency of greater than one and a glycol polyamine of either Formula I or Formula II.

FORMULA I Z t Zh t n ZB M m Z FORMULA n wherein: n and x are as previously defined, by reacting the glycol with at least 2 moles of acrylonitrile, per mole of (C Haj-N112 3,306,809 Patent ed Feb. 28, 1967 glycol, at a temperature of from about 20 C. to about 60 C. in the presence of an alkali metal alkoxide, such as sodium methoxide, to form the corresponding cyanoalkylated compound. The cyanoalkylated compound is then hydrogenated at a temperature of from about C. to about C. in the presence of nickel, as a catalyst, and at pressures on the order of about 1500 p.s.i.g.

Compounds falling within the purview of Formula II can be prepared by cyanoalkylating a glycol having the formula:

FORMULA IV Suitable glycols which can be cyanoalkylated with acrylonitrile include, among others, poly(ethylene glycol), poly(diethylene glycol), poly(l,2-propylene glycol), poly- (1,3-propylene glycol), poly(1,4-butylene glycol), poly- (glycerol) and the like. Illustrative of specific compounds falling within the scope of Formulas I and H are the following:

a,w-di-(3-aminopropyl)-etl1er of a poly(ethylene glycol) which has an average molecular weight of about 1600, 0:,w-di-(3-21II1iI1OPIOPYl)-the1 of a poly(diethylene glycol) which has an average molecular weight of about 3000', a,w-di-(3-aminopropyl)-ether of a poly(1,2-propylene glycol) which has an average molecular weight of about 1025, a,w-di-(3-arninopropyl)-ether of a poly(1,2-propylene glycol) which has an average molecular weight of about 2025, tris(3-aminopropyl)-ether of poly(oxypropylglycerol) which has an average molecular weight of about 3200.

Various amounts of the glycol polyamines can be used to cure the polyepoxides to infusible products. Generally, the glycol polyamines are used in amounts of from about 75 percent of stoichiometric to about 15 percent in excess of stoichiometric. Optimum properties in cured polyepoxide compositions are achieved using about stoichiometric amounts of the glycol polyamines. For purposes of stoichiometric calculations, one epoxy group is deemed to react with one amino hydrogen atom.

The polyepoxides which can be cured with the glycol polyamines are those organic compounds having an epoxy equivalency of greater than one, that is compounds having an average of more than one epoxy group, i.e.,

per molecule. These compounds, wherein the oxygen of the epoxy group is attached to vicinal carbon atoms, can be saturated or unsaturated, aliphatic, cycloaliphatic, or heterocyclic, and can be substituted, with substituents such as halogen atoms, alkyl groups, ether groups, and the like.

In further explanation of the term epoxy equivalency, this term generally refers to the average number of epoxy groups contained in the average polyepoxide molecule. This value is obtained by dividing the molecular weight of the polyepoxide by its calculated epoxide equivalent weight. The epoxide equivalent weight is usually determined by heating a one gram sample of the polyepoxide with an excess of pyridinium chloride which is dissolved in pyridine. The excess pyridinium chloride is then back-titrated with 0.1 N sodium hydroxide to an end point using phenolphthalein as the indicator. The epoxy equivalent weight is calculated by considering that one HCl molecule is equivalent to one epoxide group. If the polyepoxide is a single compound and all of its epoxy groups are intact, the epoxy equivalency values will be integers of whole numbers, such as 2, 3, 4 and the like. In those instances wherein the polyepoxide is a mixture of polyepoxides or contains some monomeric monoepoxides or where the polyepoxide has some of its epoxy groups hydrated or otherwise reacted, the epoxy equivalency values may contain fractions, such as 1.2, 1.5, 2.8, and the like.

Illustrative of polyepoxides which can be cured with the glycol polyamines are the polyglycidyl ethers of polyhydric phenols, exemplified by the polyglycidyl ethers of such phenols as the mononuclear polyhydric phenols, resorcinol and pyrogallol; the dior polynuclear phenols, such as the bisphenols described in Bender et al. U.S. Patent 2,506,486 and polyphenolols such as the novolac condensation products of a phenol and a saturated or unsaturated aldehyde containing an average of from 3 to 20 or more phenylol groups per molecule (cf. Phenoplasts by T. S. Carswell, published 1947 by Interscience Publishers, New York). Exemplary of suitable polyphenylols derived from a phenol and an unsaturated aldehyde such as acrolein are the triphenylols, pentaphenylols, and heptaphenylols described in U.S. Patent 2,855,385 to A. G. Farnham. The phenols may contain substituents such as alkyl or aryl ring substituents or halogens, as exemplified by the alkyl resorcinols, tribromoresorcinol, and the diphenols containing alkyl and halogen substituents on the aromatic ring (Bender et al., U.S. Patent 2,506,486). The polyhydric polynuclear phenols can consist of two or more phenols connected by such groups as methylene, alkylidene or sulfone. The connecting groups are further exemplified by bis-(p-hydroxyphenyl)-methane, 2,2-bis-(p-hydroxyphenyl) propane and dihydroxydiphenyl sulfone.

Process for the preparation of polyglycidyl ethers of' polyhydric phenols is described in detail in the Bender et al. patent (supra) and U.S. Patent 2,801,989 to A. G. Farnham.

Particularly desirable for purposes of this invention are the polyglycidyl ethers of the his (hydroxyphenyl)-alkanes as for example, the diglycidyl ether of 2,2-bis-(p-hydroxyphenyl)-propane and the diglycidyl ether of bis(p-hydroxylphenyl) methane. Other suitable polyglycidyl ethers of polyhydric phenols are enumerated in U.S. Patent 2,63 3,458 to E. C. Shokal.

Also suitable are the polyglycidyl ethers of polyhydric alcohols, such as the reaction products of epichlorohydrin and aliphatic compounds containing from two to four alcoholic hydroxyl groups, such as ethylene glycol, propane diols, butane diols, glycerine, hexane triols, and the like. (Methods of preparing polyglycidyl ethers of polyhydric alcohols are described in U.S. Patent 2,898,349 to P. Zuppinger et al.)

Other suitable polyglycidyl compounds are the polyglycidyl esters of polycarboxylic acids, such as the polyglycidyl esters of adipic acid, phthalic acid, and the like. Polyglycidyl esters of polycarboxylic acids are described in detail in U.S. Patent 2,870,170 to Payne et a1. Also suitable are polyglycidyl compounds produced by reacting epichlorohydrin with aromatic amines, such as aniline, 2,6-dimethylaniline, p-toluidine, m-chloraniline, p-amino diphenyl, m-phenylenediamine, p-phenylenediamine, 4,4- diaminodiphenyl methane, or with amino phenols such as p-aminophenol, 5-amino-1-n-naphthol, 4-aminoresorcinol, 2-methyl-4-aminophenol, 2-chloro-4-aminophenol, and the like. Specific compounds include, among others, N,N-diglycidylaniline, N,N-diglycidyl 2,6-dimethylaniline, N,N,N,N'-tetraglycidyl-4,4' diaminodiphenyl methane, the triglycidyl derivative of p-aminophenol wherein the amino-hydrogen and OH hydrogen atoms are replaced by glycidyl groups. Polyglycidyl derivatives of aromatic amines and amino phenols and methods for their preparation are further described in U.S. Patents 2,951,825

and 2,951,822 to N. H. Reinking and N. H. Reinking et al., respectively. The so-called peracetic acid epoxides which are obtained by epoxidation across a double bond, such as bis-(2,3-epoxycyclopentyl) ether, 3,4-epoxy-6- methylcyclohexylrnethyl 3,4-epoxy 6 methyl-cyclohexane carboxylate, vinylcyclohexene dioxide, dicyclopentadiene dioxide and the like are also suitable.

It is to be understood that all patents and literature references referred to in this specification are incorporated herein by reference.

The polyepoxides and the glycol polyamines are combined by simply admixing the two together, generally at temperatures of about 40 C. to about 50 C. In those instances wherein the polyepoxides are relatively low viscosity liquids, they are admixed directly with the glycol polyamines. Polyepoxides which are too viscous for ready mixing with the glycol polyamines can be heated to reduce their viscosity or liquid diluents can be added thereto in order to provide the desired fluidity. Normally solid polyepoxides are either melted or mixed with liquid diluents.

Suitable solvents for imparting the desired fluidity to highly viscous or normally solid polyepoxides are ketones, such as acetone, methyl isobutyl ketone, isophorone, and the like; esters, such as ethyl acetate, butyl acetate, ethylene glycol monoacetate, acetate of ethylene glycol monomethyl ether and the like; ether alcohols, such as the methyl, ethyl, and butyl ether of ethylene glycol or of diethylene glycol; chlorinated hydrocarbons, such as trichloropropane, chloroform, and the like. Also suitable in admixture with the solvents noted are the aromatic hydrocarbons, such as benzene, toluene, xylene and the like; alcohols, such as ethyl alcohol, isopropyl alcohol, n-butyl alcohol and the like. The actual amount of solvent used Will depend upon the polyepoxide being employed. If desired, rather than using solvents of the type described, or in addition thereto, reactive liquid diluents containing a single epoxy group:

can be used in order to achieve the desired fluidity in the polyepoxides. Among such suitable reactive liquid diluents are butyl glycidyl ether, allyl glycidyl ether, phenyl glycidyl ether and the like. In determining stoichiometric amounts with respect to the glycol polyamines, the presence of reactive diluents is taken into account.

Additional materials such as fillers, pigments, fibers, dyes, plasticizers, peroxides such as henzoyl peroxide, accelerators such as triphenyl phosphite and the like can also be added to the compositions of this invention, it so desired.

Although the compositions of this invention will cure to infusible products having excellent flexibility, excellent elongation and excellent heat-aging properties without the necessity of adding other curing agents, it is customary to add thereto, in addition to the glycol polyamines, conventional hardeners, that is compounds which themselves are reactive with polyepoxides. These hardeners serve the purpose of decreasing the time of the curing cycle. The time of the curing cycle in each instance will depend upon the exact composition and the temperature to which the composition is heated.

When used, the hardener is present in amounts such that the total amount of hardener and glycol polyamine present in the compositions is from about 75 percent of stoichiometric to about 15 percent in excess of stoichiometric with the glycol polyamine being present in 'at least about 5 and preferably about 20% of stoichiometric.

Illustrative of suitable hardeners are those compounds containing replaceable hydrogen atoms, as for example the polyamines having the formula:

wherein: y is an integer from zero to 3 inclusive, 2 is an integer from 2 to 6 inclusive, R in each instance is a monovalent substituent being either hydrogen or a hydroxyalkyl group wherein the alkyl group preferably contains from 1 to 4 carbon atoms inclusive, as for example, hydroxyethyl and hydroxypropyl, the hydroxyalkyl groups in any molecule not necessarily being the same, and the number of instances per molecule where R represents a hydroxyalkyl group being a whole number which is at least one, but less than y+2.

Typical hydroxyalkyl alkylene polyamines coming within the scope of the above structural formula are the following: N-hydroxyethyl ethylene diamine, N-hydroxyethyl pentamethylene diamine, N-hydroxypropyl tetramethylene diamine, N-hydroxyethyl diethylene triamine, N,N-dihydroxyethyl diethylene triamine, N,N"-dihydroxy ethyl diethylene triamine, N-hydroxypropyl diethylene triamine, N,N-dihydroxypropyl diethylene triamine, N,N"-dihydroxypropyl diethylene triamine, N- hydroxyethyl propylene diamine, N-hydroxypropyl propylene diamine, N-hydroxyethyl dipropylene triamine, N,N-dihydroxyethyl dipropylene triamine, N,N-dihydroxyethyl dipropylene triamine, tris-hydroxyethyl triethylene tetramine and the like.

Preparation of hydroxyalkyl alkylene polyamines is described in US. Patent 2,901,461 to V. Auerbach et al.

Other suitable polyamine hardeners include, among others, the adducts formed on reacting at temperatures of about 0 C. to about 100 C. a polyamine having Formula V, previously noted or a polyamine having the formula:

FORMULA VI wherein: in has a value of from 2 to 10 inclusive, preferably from 2 to 6 inclusive and p has a value of from 1 to 6 inclusive, preferably 1 to 4 inclusive; with at least about 0.33 mole and preferably from about 0.5 mole to about 1.0 mole, per mole of amine, of an acryla-te having the formula:

FORMULA VII CH2=(I)C=O wherein: R is an alkyl radical, preferably containing from 1 to 18 carbon atoms inclusive; R is either hydrogen or alkyl having a maximum of 2 carbon atoms.

Among suitable polyamines falling within the scope of Formula VI are: 1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,8-diaminooctane, 1,9-diaminononane, 1,10- diaminodecane, diethylenetriamine, triet-hylenete-tramine, tetratethylenepentamine, dipropylenetriamine and the like. Illustrative of acryl'ates coming within the purview of Formula VI which can be reacted with the polyamines to produce the amine-acrylate adducts are the following: methylacrylate, ethylacrylate, n-propylacrylate, isopropylacrylate, n-butylacrylate, n-amylacrylate, n-hexylacrylate, 2-ethylhexylacrylate, n-octylacrylate, n-nonylacrylate, n-laurylacrylate, n-pentadecylacrylate, n-octadecylacrylate, methylmethacrylate, methylethacrylate, isopropylmethacrylate, n-hexylmethacrylate, n-nonylmethacrylate, ethyletha-crylate, n-propylethacrylate, n-butylethacrylate, n-amylethacrylate, n-hexylethacrylate, Z-ethylhexylethacrylate, n-octadecylethacrylate and the like.

In addition to the amines noted other suitable amine hardening agents are: 2-aminoe-thanol, 2-aminopropanol, 3-aminobutanol, 1,3-diamino-2-propanol, m-aminophenol, p-aminophenol, 4,4-methylenedianiline, m-phenylenediamine and the like.

Stoichiometry calculations with respect to the amines noted are based on replaceable hydrogen atoms.

Exemplary of other suitable hardening agents are the phenols as for example, phenol, o-cresol, m-cresol, p-cresol, o-chlorophenol, m-chlorophenol, p-chlorophenol, pbromophenol, 2,4,6-trichloropheno1, 2,4,6-tribromophenol, guaiacol, anol, eugenol, iso-eugenol, saligenin, carvacrol, thymol, o-hydroxyacetophenone, p-hydroxy'acetophenone, p-hydroxydiphenyl, o-hydroxydiphenyl, o-cyclohexylphenol, p-cyclohexylphenol; polyhydric phenols such as catechol, hydroquinone, hydroxyhydroquinone, phloroglucinol, resorcinol and pyrogallol; the di-or poly-nuclear phenols such as the bisphenols described in Bender et al. United States Patent 2,506,486, and polyphenylols such as novolac condensates of a phenol and a saturated or unsaturated aldehyde containing an average of from 3 to 20 or more phenylol groups per molecule (cf. book by T. S. Carswell entitled Phenoplasts, published in 1947 by In-terscience Publishers of New York). Examples of suitable polyphenylols derived from a phenol and an unsaturated aldehyde such as acrolein, are the triphenylols, pentaphenylols and heptaphenylols described in US. Patent 2,885,385 to A. G. Farnham.

The phenols may contain alkyl or aryl ring substituents or halogens, as exemplified by the alkyl resorcinols, the tribromoresorcinol and the diphenols containing alkyl and halogen substi-tuents on the aromatic ring (Bender et al., US. Patent 2,506,486).

The polyhydric polynuclear phenols can consist of 2 or more phenols connected by such groups as methylene, alkylidene, ether, ketone or sulfone. The connecting groups are further exemplified by the following compounds: bis-(p-hydroxyphenyl) ether, bis-(p-hydroxy phenyl)-sulfone, bis-(p-hydroxyphenyl)-methane, bis-(phydroxyphenyl) -propane.

For purposes of stoichiometric caculations with respect to phenols, one hydroxy group is deemed to react with one epoxy group.

In addition to the hardening agents previously listed, polycarboxylic acids and anhydrides thereof can also be employed. Among suitable carboxylic acids are those of the formula:

HOOC(CH COOH The examples which follow further illustrate the pres ent invention and are not intended to limit the scope thereof in any manner.

Amounts noted in the examples are in parts by weight. Values as to physical properties were determined according to the following test procedures:

Tensile strengthASTMD 63 8-58T Percent elongation-ASTMD 638-58T Flexural strength-ASTMD 790-58T Izod impact-ASTMD 256-56 Hardness-ASTMD 676 (A Scale), ASTMD 1484 (D Scale) Example 1 Compositions Whose formulations are noted below were formulated by heating each component to C.

and then blending the preheated components together in a beaker for 2 minutes at room temperature. The compositions so formulated were cast into bars having the following dimensions 8 inches by 1 inch by .25 inch. The bars were heated at 90 C. for 1 hour and at 160 C. for 6 hours. Physical properties of the compositions were determined using the bars so prepared in the tests which are also noted below.

The diglycidyl ether of 2,2-bis-(p-hydroxyphenyl)- propane noted in this and in subsequent examples had an epoxy equivalency of 2 and an epoxy equivalent weight of 190 grams per gram mole.

The hardener noted in this example was a mixture of 56.7 parts by weight m-phenylenediamine, 30.3 parts by weight 4-4-methylenedianiline and 13.3 parts by weight of diglycidyl ether of 2,2-bis-(p-hydroxyphenyl)-propane, identified in the preceding sentence.

The hardener was present in an amount of 80 percent of stoichiometric in Composition A and 60 percent of stoichiometric in Composition B.

The -di-(3-aminopropyl)-ether of poly(propylene glycol) noted in this example and in subsequent examples has the formula:

and was present in Composition A in an amount of 20 percent of stoichiometric and in Composition B in an amount of 40 percent of stoichiometric.

Example 1 was repeated using as the curing agent, in lieu of the hardener described and the di-(3-aminopropyl)-ether of poly-(propylene glycol), a stoichiometric amount of a compound having the formula:

Example 2 Compositions, whose formulations are noted below, were formulated, cast into bars and the bars subjected to a heating cycle, all as described in Example 1.

Composition Composition D Diglyeidyl ether of 2,2-bis-(p-hydroxyphenyl)-propane 100 1 (l0 m-Phenylenediamine 11. 6 8. 7 Di-(3-aminopropyl)-cther 01' po (prop lene glycol) 64 128 Tensile strength, p 2, 742 Percent elongation 24 39 Hardness, Shore D:

As prepared 65 Tested after being kept at 125 C. for

one week 72 Meta-phenylenediamine was present in Composition C is an amount of percent of stoichiometric and in Composition D in an amount of 60 percent of stoichiometric.

Di-(3-aminopropyl)-ether of poly(propylene glycol) was present in Composition C in an amount of 20 percent of stoichiometric and in Composition D in an amount of 40 percent of stoichiometric.

Example 2 was repeated using as the sole curing agent a stoichiometric amount of m-phenylenediamine. This composition was not flexible as indicated by a percent elongation value of only 3.1 and a Shore D value of 1 00 (tested without being heat aged).

Example 3 Compositions, whose formulations are noted below, were formulated, cast into bars and the bars subjected to a heating cycle, all in a manner identical to that described in Example 1.

Composition Composition E F Diglycidyl ether of 2,2-bis-(p-hydroxyphenyD-propane 100 4,4-methylenedianiline 22. 4 16. 8 Di-(3-aminopropyD-ether of poly(propylene glycol) 64 128 Tensile strength, p.s.i 2, 857 Percent elongation 22 48 Hardness, Shore D As prepared 67 Tested after being kept at C. for

one week 71 4,4-methylenedianiline was present in Composition E in an amount of 80 percent of stoichiometric and in Composition F in an amount of 60 percent of stoichiometric.

Di (3-aminopropyl)-ether of poly(propylene glycol) was present in Composition E in an amount of 20 percent of stoichiometric and in Composition F in an amount of 40 percent of stoichiometric.

Example 4 Compositions, whose formulations are noted below, were formulated and cast into bars in a manner identical to that described in Example 1. The bars were subjected to the following heating cycle: 5 hours at 100 C., 1' hour at C. and then 6 hours at 200 C.

Composition G 'Diglycidy ether of 2,2-b is-(p-hydroxyphenyl)- propane 100 Hexahydrophthal-ic anhydride 64 D-i (3 aminopropyl) ether of poly(propylene tglycol) Tensile strength, p.s.i 2012 Percent elongation 45 Hardness, Shore D:

As prepared 58 Tested after being kept at 125 C. for one week 64 Hexahydrophthalic anhydride was present in Composition G in an amount of 80 percent of stoichiometric.

Di-(3-amino propyl)-ether of poly(propylene glycol) was present in Composition G in an amount of 20 percent of stoichiometric.

Example 4 was repeated using as the sole curing agent a stoichiometric amount of hexahydrophthalic anhydride. This composition was not flexible as indicated by a 100 Shore D value (tested without being heat aged) and by the fact that it was too brittle to test for percent elongation.

Example 5 Compositions, whose formulations are noted below, were formulated and cast into bars in a manner identical to that described in Example 1. The bars were subjected 9 to the following heating cycle: 16 hours at 90 at 160 C. and then 6 hours at 200 C.

C., 1 hour Methyl nadic anhydride (methyl-bicyclo- (2,2,l)hept-S- ene-2,3-dicarboxylic anhydride) was present in Composition H in an amount of 80 percent of stoichiometric and in Composition I in an amount of 60 percent of stoichiometric.

Di-(3-aminopropyl)-ether of poly(propylene glycol) was present in Composition H in an amount of 80 percent of stoichiometric and in Composition 1 in an amount of 40 percent of stoichiometric.

Example 5 was repeated using as the sole curing agent a stoichio-metric amount of methyl nadic lanhydride. This composition was not flexible as indicated by a 100 Shore D value (tested without being heat aged) and by the fact that it was too brittle to test for percent elongation.

Example 6 Composiitons, whose formulations are noted below, were formulated and cast into bars in a manner identical to that described in Example 1. The bars were subjected to the following heating cycle: minutes at 110 C., and then 4 hours at 160 C.

Di-3 -aminopropyl)-ether of poly(propylene :glycol) was present in Composition K in an amount of percent of stoichioinetric and in Composition L in an amount of 40 percent of stoichiometric.

The novolac resin was present in Composition K in an amount of 80 percent of stoichiometric and in Composition L in an amount of 60 percent of stoichiometric.

The novolac resin was produced by changing a still with:

Phenol 949 Formalin 126.5 Zinc oxide 3.2

and heating the contents of the still first to reflux (113 C.-l15 C.) for 2.5 hours, then to 160 C. allowing water to distill off. The contents of the still were held at 160 C. for 30 minutes after which time a vacuum of 50 mm. of Hg was applied and the mass in the still steam distilled.

Example 7 Compositions, whose formulations are noted below were formulated and cast into bars in a manner identical to that described in Example 1. The bars so cast were subjected to the following heating cycle: 15 minutes at 110 C. and then 4 hours at 160 C.

Composition Composition L M Diglyeidyl ether of 2, 2-bis-(p-hydroxylphenyD-propane 100 100 Novolac resin 44 33 Di-(3-aminopropyl)-ether of poly(propylene glycol) 64 128 Tensile strength, p.s. 2, 481 Percent elongation 38 47 Hardness, Shore D:

As prepared 58 Tested after being held at 125 C. for

one week 65 Di-(3-aminopropyD-ether of poly(propylene glycol) was present in Composition L in an amount of 20 percent of stoichiometric and in Composition M in an amount of 60 percent of stoichiometric.

The novolac resin was present in Composition L in an amount of percent of stoichiometric and in Composition M in an amount of 60 percent of stoichiometric.

The novolac resin was prepared as follows: a mixture of parts by weight of phenol and 73 parts by weight formalin (37%), adjusted with oxalic acid to pH of l.011.1 was vacuum refluxed in a still at 90 C. to cloudiness. The temperature of the mixture was gradually increased to 120 C. by the steady application of pressure and reflux was continued for two hours at 120 C. At the end of this two hour period, pressure was released and the system was dehydrated until the residue temperature reached 160 C. The resin so produced was discharged into a pan and air cooled to room temperature, about 23 C. The resin was hard, grindable and had a melting point of C. C.

Example 7 was repeated using as the sole curing agent a stoichiometric amount of the novolac resin. This composition was so brittle that it could not be subjected to any of the tests previously noted.

Example 8 The composition, whose formulation is noted below was formulated and cast into bars in a manner identical to that described in Example 1. The bars so cast were subjected to the following heating cycle: 20 hours at 90 C. and then 6 hours at 160 C.

Composition N Bis-2,3-epoxycyclopentyl) ether 100 Hardener 61 Di (3 aminopropyl) ether of poly(propylene glycol) 34 Tensile strength, p.s.i 4635 Percent elongation 7.1 Hardness, Shore D:

As prepared 79 Tested after being kept at C. for one week, 80

The hardener noted was the same as used in Example 1 and was present in Compostion N in an amount of 90 percent of stoichiometric.

Di-(3-aminopropyl)-ether of poly( propylene glycol) was present in Composition N in an amount of 10 percent of stoichiometric.

Example 9 A composition, whose formulation is noted below, was formulated and cast into bars in a manner identical to that described in Example 1. The bars so cast were subjected to the following heating cycle: 2 hours at 100 C. and then 2 hours at C.

Composition Diglycidylether of 2,2 bis (p-hydroxyphenyl)- propane 100 I-hydrOXy-Z-aminoethane 12 Di (3 aminopropyl) ether of poly(propylene glycol) Tensile strength, p.s.i 1088 Percent elongation 265 1-hydroxy-2-aminoethane was present in Composition 0 in an amount of 73 percent of stoichiometric.

Di-(3-aminopropyl)-ether of poly(propylene glycol) was present in Composition 0 in an amount of 27 percent of stoichiometric.

Example A composition, whose formulation is noted below, was formulated and cast into 'bars in a manner identical to that described in Example 1. The bars so cast were subject to the following heating cycle: 2 hours at 100 C. and then 2 hours at 150 C.

Composition P Diglycidyl ether of 2,2 -bis-(p-hydroxyphenyl)- propane 100 Di-(3-aminopropyl)-ether of diethylene glycol 23 Tris- 3 -aminopropyl -ether of poly (oxypropylgylcerol) Tensile strength, p.s.i 1870 Percent elongation 91 Flexural strength, p.s.i 1750 Izod impact strength, ft. lbs/inch notch 3.01

Di-(3-aminopropyl)-ether of diethylene glycol, having the formula:

2 2)3 z z )2( 2)3 z was present in Composition P in an amount of 80 percent of stoichiometric.

Tris(3-aminopropy1-ether of poly(oxypropylglycerol) the formula wherein the sum of a, b and c is about 48 and was present in Composition P in an amount of 20 percent of stoichiometric.

Example 11 A composition of 100 parts by weight of diglycidyl ether of 2,2-bis-(p-hydroxyphenyl)-propane (described in Example 1) and 95 parts by weight of a mixture made up of: 74 parts by weight of N-hydroxyethyl diethylene triamimine, 31 parts by weight of l-hydroxy-Z-aminoethane, 50 parts by weight of the glycol polyamine described in Example 1 and 184 parts by weight of 2-ethylhexylacrylate, was admixed at 98 C. to a homogeneous blend and then poured between a television picture tube and a glass implosion shield which were mounted in a jig. The composition was then cured to an infusible product, bonding the implosion shield to the television picture tube, by heating the composition at 98 C. for /2 hour.

In order to further illustrate the excellent heat-aging properties of the compositions of this invention, the television picture tube to which was bonded the implosion shield by means of composition described in the preceding paragraph was heat-aged according to the following cycle: 200 hours at 155 C. and then 40 hours at 170 C.

At the end of this time, the implosion shield was still strongly bonded to the television picture tube.

In order to demonstrate that the compositions of this invention also serve as protective coatings, the television picture tube, to which was bonded the implosion shield, was deliberately imploded. The implosion shield did not shatter.

What is claimed is:

1. Curable composition comprising a polyepoxide having an epoxy equivalency of greater than one, and a glycol polyamine of the formula:

wherein: n has a value of 2 to 10 inclusive and the sum of a, b and c has a value of '3 to inclusive, said glycol polyamine being present in said composition in an amount of about 75 percent of stoichiometric to about 15 percent in excess of stoichiometric 2. The cured product of the composition defined in claim 1.

3. Curable composition as defined in claim 1 wherein the polyepoxide is a polyglycidyl ether of a polyhydric phenol.

4. The cured product of the composition defined in claim 3.

5. Curable composition as defined in claim 1 wherein the polyepoxide is diglycidyl ether of 2,2-bis-(p-hydroxyphenyl) -propane.

6. The cured product of the composition defined in claim 5.

7. Curable composition as defined in claim 1 wherein the polyepoxide is bis-(2,3-epoxy-cyclopentenyl)-ether.

8. The cured product of the composition defined in claim 7.

9. Curable composition as defined in claim 1 wherein the glycol polyamine is tris-(3-aminopropyl)-ether of poly (oxypropylglycerol) of the formula:

wherein: n is an integer having a value of 2 to 10 inclusive and the sum of a, b and c has a value of 3 to 100 inclusive, said glycol polyamine being present in said composition in an amount sufiicient to cure said composition to an intus bl product.

(C H2) s-NH:

13 13. The cured product of the composition defined in claim 12.

14. Curable composition comprising a polyepoxide having an epoxy equivalency of greater than one and a glycol polyamine of the formula:

wherein: n is an integer having a value of 2 to inclusive and the sum of a, b and c has a value of 3 to 80 inclusive, said glycol polyamine being present in said composition in an amount of from about 75 percent of stoichioznetric to about 15 percent in excess of stoichiornetric.

15. Curable composition as defined in claim 14 wherein said glycol polyamine is present in said composition in about a stoichiometric amount.

16. Curable composition comprising a polyepoxide having an epoxy equivalency of greater than one and a glycol polyamine of the formula:

H \Cn 2x10 jc wherein: n is an integer having a value of 2 to inclusive and the sum of a, b, and c has a value of 3 to 100 inclusive, said glycol polyamine being present in said composition in about a stoichiometric amount.

17. Curable composition comprising a polyepox'de having an epoxy equivalency of greater than one, a hardener selected from the group consisting of polyamines, phenols, novolac condensates of a phenol and an aldehyde, polyphenylol reaction products of a phenol and an unsaturated aldehyde, and polycarboxylic acids and anhydrides thereof, and a glycol polyamine of the formula:

..H ..o \C 2 /0 wherein: n is an integer having a value of 2 to 10 inclusive and the sum of a, b and c has a value of 3 to 100 inclusive, the total amount of said glycol polyamine and said hardener present in said composition being from about 75 percent of stoichiometric to about percent in ex cess of stoichiometric with the said glycol polyamine being present in at least about 5 percent of stoichiometric.

18. Curable composition comprising a polyepoxide having an epoxy equivalency of greater than one, a hardener of the formula:

R maniac...)

(C H2) a-NHz wherein: y has a value of O to 3 inclusive, 2 has a value of 2 to 6 inclusive and each R is selected from the group consisting of hydrogen and hydroxyalkyl with the further limitation that the number of instances per molecule where R represents hydroxyalkyl being a whole number which is at least 1 but less than y+2, and a glycol polyamine of the formula:

wherein: n is an integer having a value of 2 to 5 inclusive and the sum of a, b and c has a value of 3 to 80 inclusive, the total amount of said glycol polyamine and said hardener present in said composition being from about percent of stoichiometric to about 15 percent in excess of stoichiometric with the said glycol polyamine being present in at least about 5 percent of stoichiometric.

.19. Curable composition as defined in claim 17 where in the total amount of said glycol polya mine and said hardener present in said composition is about a stoichiometric amount.

20. Curable compositon as defined in claim 19 wherein the hardener is a mixture of m-phenylenediamine, 4,4- methylene dianiline and diglycidyl ether of 2,2bis-(p-hydroxyphenyl)-propane.

21. C-urable composition as defined in claim 19 wherein the hardener is m-phenylenediamine.

22. Curable composition as defined in claim 19 wherein the hardener is 4,4methylenedianiline.

23. Curable composition as defined in claim 19 wherein the hardener is hexahydrophthalic anhydride.

24. Curable composition as defined in claim 19 wherein the hardener is methyl-bicyclo(2,2,1)-hept-5-en e-2,3- dicarboxylic anhydride.

25. Curable composition as defined in claim 19 wherein the hardener is an acid catalyzed phenol-formaldehyde condensate.

26. Curable composition as defined in claim 19 wherein the hardener is ethanolamine.

27. Curable composition as defined in claim 19 wherein the hardener is a glycol diamine of the formula:

References Cited by the Examiner UNITED STATES PATENTS 2,585,115 2/1952 Grcenlee 26047 2,723,241 11/1955 DeGroote et a1. 260'47 2,957,844 10/1960 Wesp 26049 2,982,751 5/1961 Anthes 26029.2

WILLIAM H. SHORT, Primary Examiner.

LEON J. BERCOVITZ, Examiner.

D. W. ERICKSON, T. PERTILLA, Assistant Examiners. 

1. CURABLE COMPOSITION COMPRISING A POLYEPOXIDE HAVING AN EPOXY EQUIVALENCY OF GREATER THAN ONE, AND A GLYCOL POLYAMINE OF THE FORMULA: 